QoS support in the UMTS/GPRS backbone network using DiffServ

The Universal Mobile Telecommunications System (UMTS) has a number of service classes that require end-to-end QoS support. This requirement imposes on the design of the UMTS backbone bearer service as a part of the UMTS hierarchical QoS architecture. This paper presents a methodology of provisioning QoS in the UMTS backbone network based on the Differentiated Services (DiffServ) model, a relatively simple but scalable IP-based QoS technology. This requires proper choices of QoS mapping, router configurations, and admission control. In this paper, the framework for setting a DiffServ-based backbone router as well as the requisite mapping functions for QoS interworking are addressed specifically for UMTS services. Efficient algorithms are introduced for the router model, particularly for the scheduling and buffer management components, to enhance QoS provisioning in UMTS. The effectiveness of this approach is illustrated by computer simulations.